spi: bcm-qspi: Convert to use CS GPIO descriptors

Set use_gpio_descriptors to true and avoid asserting the native chip
select if the spi core has done it for us.

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Link: https://lore.kernel.org/r/20191107044235.4864-2-chris.packham@alliedtelesis.co.nz
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-bcm-qspi.c b/drivers/spi/spi-bcm-qspi.c
index 7a35318..85bad70 100644 (file)
--- a/drivers/spi/spi-bcm-qspi.c
+++ b/drivers/spi/spi-bcm-qspi.c
@@ -803,7 +803,8 @@ static int bcm_qspi_bspi_exec_mem_op(struct spi_device *spi,
                        return -EIO;
 
        from = op->addr.val;
-       bcm_qspi_chip_select(qspi, spi->chip_select);
+       if (!spi->cs_gpiod)
+               bcm_qspi_chip_select(qspi, spi->chip_select);
        bcm_qspi_write(qspi, MSPI, MSPI_WRITE_LOCK, 0);
 
        /*
@@ -882,7 +883,8 @@ static int bcm_qspi_transfer_one(struct spi_master *master,
        int slots;
        unsigned long timeo = msecs_to_jiffies(100);
 
-       bcm_qspi_chip_select(qspi, spi->chip_select);
+       if (!spi->cs_gpiod)
+               bcm_qspi_chip_select(qspi, spi->chip_select);
        qspi->trans_pos.trans = trans;
        qspi->trans_pos.byte = 0;
 
@@ -1234,6 +1236,7 @@ int bcm_qspi_probe(struct platform_device *pdev,
        master->cleanup = bcm_qspi_cleanup;
        master->dev.of_node = dev->of_node;
        master->num_chipselect = NUM_CHIPSELECT;
+       master->use_gpio_descriptors = true;
 
        qspi->big_endian = of_device_is_big_endian(dev->of_node);